Following up on this for a third time because I have received no responses.
Has anyone on the list had a chance to look at this issue?
I have an app that uses Bonjour to detect other services of its type on the
network. It works as expected with Bonjour under Win32, however I need it to
work on Linux as well. It's not feasible to rewrite the code with the Avahi
API because I need it to work primarily on Win32. So I'm trying to use the
Bonjour compatibility layer in Avahi, but having problems with the most basic
of operations: Browsing.
Sample code is provided below. It's just a simple service discovery.
-------------------------------------
/**
* Spends 5 seconds browsing for services of the given regtype. If any are
* found, their names are output.
*
* Build: g++ AvahiBonjourTest.cpp -o AvahiBonjourTest -ldns_sd
*
* Run: ./AvahiBonjourTest [regType]
* - If no regtype is given, _ipp._tcp" is used.
*/
#ifndef WIN32
#include <sys/select.h>
#endif // ndef WIN32
#include <dns_sd.h>
#include <stdio.h>
#include <iostream>
using namespace std;
void DNSSD_API ProcessBrowseResult( DNSServiceRef sdRef, DNSServiceFlags flags,
uint32_t interfaceIndex, DNSServiceErrorType errorCode,
const char *serviceName, const char *regtype, const char *replyDomain,
void *context )
{
if( errorCode == kDNSServiceErr_NoError )
{
cout << " * Found a " << regtype << " service at \"" <<
serviceName
<< "\"!" << endl;
}
else
{
cout << " * ProcessBrowseResult(): Bonjour error " << errorCode
<< endl;
}
}
int main( int argc, const char* argv[] )
{
const char* regType = ( argc > 1 ? argv[1] : "_ipp._tcp" );
DNSServiceRef browseSvc = 0;
cout << "Looking for services of type " << regType << "..." << endl;
// Start the browse operation
int errorCode = DNSServiceBrowse( &browseSvc, 0, 0, regType, 0,
ProcessBrowseResult, 0 );
if( errorCode != kDNSServiceErr_NoError )
{
cout << " * DNSServiceBrowse(): Bonjour error " << errorCode <<
endl;
DNSServiceRefDeallocate( browseSvc );
return 0;
}
fd_set readfds;
FD_ZERO( &readfds );
FD_SET( DNSServiceRefSockFD( browseSvc ), &readfds );
timeval tv;
tv.tv_sec = 5;
tv.tv_usec = 0;
// Wait for a response from mDNSResponder, or until timeout, whichever
is
// first
int result = select( 1, &readfds, NULL, NULL, &tv );
if( result == -1 )
{
perror( " * select() threw an error" );
}
else if( result > 0 )
{
cout << " * Got a result! processing..." << endl;
// Read the response and call ProcessBrowseResult()
errorCode = DNSServiceProcessResult( browseSvc );
}
else
{
cout << " * select() timed out" << endl;
}
DNSServiceRefDeallocate( browseSvc );
return 0;
}
-------------------------------------
There are 4 printers on the network. On Windows with Bonjour a service is
found immediately:
Looking for services of type _ipp._tcp...
* Got a result! processing...
* Found a _ipp._tcp. service at "Dell Laser Printer 1720dn"!
On Linux with Avahi, no browse results are received and select() times out:
Looking for services of type _ipp._tcp...
*** WARNING *** The program 'AvahiBonjourTest' uses the Apple Bonjour
compatibility layer of Avahi.
*** WARNING *** Please fix your application to use the native API of Avahi!
*** WARNING *** For more information see
<http://0pointer.de/avahiompat?s=libdns_sd&e=AvahiBonjourTest>
* select() timed out
But I know Avahi is working, because avahi-discover shows 4 services of type
_ipp._tcp". So... why does the browse socket not returning anything? What am
I missing?
Thanks again for your help!
________________________________________
Joshua Foster
Sr. Computer Programmer
2721 X-Ray Drive
Gastonia, NC 28054
(704) 824-0199 x217
(704) 824-0241 Fax
[email protected]
www.dtiweb.net
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